Effect of modified ITO substrate on electrochromic properties of polyaniline films

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• 作者：U. Leó ; n-Silva ; M.E. Nicho ; Hailin Hu ; Rodolfo Cruz-Silva
• 关键词：Polyaniline ; Morphology ; Optical properties ; Solid electrochromic device ; Poly(3-methylthiophene)
• 刊名：Solar Energy Materials and Solar Cells
• 出版年：2007
• 出版时间：22 September 2007
• 年：2007
• 卷：91
• 期：15-16
• 页码：1444-1448
• 全文大小：366 K

文摘

In this work, we report the morphological and electrochromic properties of electrochemically synthesized polyaniline (PANI) thin films on bare and modified indium–tin oxide (ITO) glass substrates. In the last case, the surface of ITO glass was covered by a self-assembled monolayer of N-phenyl-γ-aminopropyl-trimethoxysilane (PAPTS). Atomic force microscopy images and perfilometry show that smoother and thinner PANI films were grown on PAPTS-modified ITO substrates. PANI-based electrochromic devices (ECDs) were assembled by using a viscous polymeric electrolyte (PE) of LiClO₄ and polymethyl methacrylate (PMMA) co-dissolved in a mixture of propylene and ethylene carbonate. The architectural design of the devices was glass/ITO/PANI/PE/ITO/glass. A dual ECD was also prepared by collocating a poly(3-methylthiophene) (P3MT) thin film as a complementary electrochromic element. The effect of the PAPTS-modified ITO substrate is reflected in a higher optical transmittance at bleach state and a little less color change at 550 nm of PANI-based ECDs.